[gcompris: 37/111] updated xml files

[Bruno Coudoin <bcoudoin src gnome org>]

commit 7adb8ac94cd4e1a4a35902e5ed1545d0a1229ef9
Author: serah <serah4291 gmail com>
Date:   Thu Jun 21 18:14:10 2012 +0530

    updated xml files

 src/intro_gravity-activity/intro_gravity.xml.in |   22 +++++++++++++++++++---
 1 files changed, 19 insertions(+), 3 deletions(-)
---
diff --git a/src/intro_gravity-activity/intro_gravity.xml.in b/src/intro_gravity-activity/intro_gravity.xml.in
index acd6aa9..6736150 100644
--- a/src/intro_gravity-activity/intro_gravity.xml.in
+++ b/src/intro_gravity-activity/intro_gravity.xml.in
@@ -10,9 +10,25 @@
         boarddir=""
         >
         <title>Intro gravity</title>
-        <description>Introduction to gravity</description>
-        <goal>Maintain the planet in the middle without crashing into the ones at the two ends</goal>
-        <manual>Increase and decrease the size of the planets at the two ends to see how the force on the middle planet changes and results in acceleration of the middle planet.</manual>
+        <description>Introduction to the concept of gravity</description>
+        <goal>Maintain the spaceship in the middle without crashing into the planets</goal>
+        <manual>
+        Gravity is universal and Newton's law of universal gravitation extends gravity beyond earth.This force of
+        gravitational attraction is directly dependent upon the masses of both objects and inversely proportional
+        to the square of the distance that separates their centers.
+
+        Since the gravitational force is directly proportional to the mass of both interacting objects, more massive
+        objects will attract each other with a greater gravitational force. So as the mass of either object increases,
+        the force of gravitational attraction between them also increases but this force is inversely proportional to
+        the square of the separation distance between the two interacting objects, more separation distance will
+        result in weaker gravitational forces.
+
+        Increase and decrease the size of the planets at the two ends to see how the force on the
+        spaceship changes with changes in the size and distance. This force results in acceleration of the
+        spaceship.
+
+        With every level the speed of the spaceship will increase.
+        </manual>
         <credit>www.openclipart.org</credit>
   </Board>
   <Data directory=""/>